Allen Bradley 1756-OW16I ControlLogix Isolated Relay Output Module

Product Introduction

The Allen-Bradley 1756-OW16I is a ControlLogix isolated relay output module designed to provide flexible switching of AC or DC loads through electromechanical relay contacts. With sixteen individually isolated relay output channels, this module is well suited for applications requiring electrical separation between field devices and the control system.

Unlike solid-state output modules, the 1756-OW16I uses mechanical relay contacts, allowing it to switch a wide range of voltage levels and load types. This makes it particularly valuable in mixed-voltage environments where both AC and DC field devices must be controlled from the same PLC platform.

Fully compatible with the ControlLogix chassis architecture, the module installs into a standard slot and communicates via the backplane. It is commonly used in industrial automation systems where isolation, versatility, and load flexibility are key requirements.

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Product Specifications

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Applications

• Switching mixed AC and DC loads within a single automation system

• Control of motor starters, solenoids, contactors, and pilot devices

• Industrial systems requiring electrical isolation between outputs

• Retrofit installations where relay outputs are preferred

• Applications demanding flexible voltage switching capability

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Advantages

• Sixteen individually isolated relay outputs for maximum flexibility

• Capable of switching both AC and DC loads

• Strong electrical isolation improving system safety and noise immunity

• Compatible with a wide range of industrial load types

• Clear LED indicators per channel for operational visibility

• Reliable integration within ControlLogix distributed architectures

FAQ

1. What type of outputs does the 1756-OW16I provide?
   It provides electromechanical relay outputs with normally open contacts.

2. Can the module switch both AC and DC loads?
   Yes, it supports switching of both AC and DC loads within rated limits.

3. Are the outputs isolated?
   Yes, each channel is individually isolated.

4. Is this module suitable for high inrush current applications?
   Relay contacts can handle typical industrial inrush currents, but load characteristics must be verified.

5. Does it require external suppression for inductive loads?
   Yes, suppression devices are recommended to extend relay life.

6. What type of terminal block is required?
   It uses a 36-pin removable terminal block.

7. Can it be used in redundant ControlLogix systems?
   Yes, it is compatible with redundant configurations.

8. Does it provide electronic fuse protection?
   No, protection must be implemented externally if required.

9. How are output states indicated?
   Each channel includes an LED indicating the energized state.

10. Is it suitable for low-level signal switching?
    It is primarily designed for industrial control loads rather than low-level signal circuits.

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